在VB.NET中将字符串转换为XML

我只是试图在VB.net中将字符串转换为xml文件。我得到的是一个xmlException

“根级别的数据无效。”。第1行，位置1'

我错过什么了吗

我期待的输出为

Dim filter As String
filter = 'Bal_ln_id = 110 and Bal_ln_id = 100'     
Dim xmldoc As New System.Xml.XmlDocument
xmldoc.LoadXml(filter)

110
100
'

要使用

XmlTextWriter

类执行此操作，可以执行以下操作：

<DocumentElement>
  <DATA_TABLE>
    <BAL_LN_ID>110</BAL_LN_ID>
  </DATA_TABLE>
  <DATA_TABLE>
     <BAL_LN_ID>100</BAL_LN_ID>
  </DATA_TABLE>
</DocumentElement>'

Private Function GenerateXml(ByVal ids As List(Of String)) As String
    Dim stringWriter As New StringWriter()
    Dim xmlWriter As New XmlTextWriter(stringWriter)
    xmlWriter.WriteStartDocument()
    xmlWriter.WriteStartElement("DocumentElement")
    For Each id As String In ids
        xmlWriter.WriteStartElement("DATA_TABLE")
        xmlWriter.WriteStartElement("BAL_LN_ID")
        xmlWriter.WriteString(id)
        xmlWriter.WriteEndElement()
        xmlWriter.WriteEndElement()
    Next
    xmlWriter.WriteEndElement()
    xmlWriter.WriteEndDocument()
    Return stringWriter.ToString()
End Function

然后你可以这样使用它：

<DocumentElement>
  <DATA_TABLE>
    <BAL_LN_ID>110</BAL_LN_ID>
  </DATA_TABLE>
  <DATA_TABLE>
     <BAL_LN_ID>100</BAL_LN_ID>
  </DATA_TABLE>
</DocumentElement>'

Private Function GenerateXml(ByVal ids As List(Of String)) As String
    Dim stringWriter As New StringWriter()
    Dim xmlWriter As New XmlTextWriter(stringWriter)
    xmlWriter.WriteStartDocument()
    xmlWriter.WriteStartElement("DocumentElement")
    For Each id As String In ids
        xmlWriter.WriteStartElement("DATA_TABLE")
        xmlWriter.WriteStartElement("BAL_LN_ID")
        xmlWriter.WriteString(id)
        xmlWriter.WriteEndElement()
        xmlWriter.WriteEndElement()
    Next
    xmlWriter.WriteEndElement()
    xmlWriter.WriteEndDocument()
    Return stringWriter.ToString()
End Function

---

是的，这个字符串肯定不是xml。您希望输出是什么样子的？我希望将其作为参数传递给存储的进程，因此我希望将其转换为XML。类似于110 100'的东西好吧，要创建xml，请查看xmlTextWriter类。没有一种方法可以自动从像您这样的字符串创建xml，您必须构建它VB或xml类如何知道您需要什么元素标记？更不用说如何解析未定义的表达式语言了？首先，您是如何创建“过滤器”字符串的？在您的示例中，您只需要键入它，但您大概是从一些变量创建它的？